GO:0004743 pyruvate kinase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004743 pyruvate kinase activity is the molecular function that catalyzes the final step of glycolysis: ADP + H+ + phosphoenolpyruvate = ATP + pyruvate.
• The reaction is performed by pyruvate kinase (PK) enzymes, including the PKM2 isoform that is central to the Warburg effect in cancer and immune cells.
• PKM2 activity is controlled by tetramer-dimer equilibrium, allosteric activators, and post-translational modifications such as S-nitrosylation, succinylation, and methionine oxidation.
• Loss or gain of pyruvate kinase activity is linked to cancer, fibrosis, diabetes, and inflammatory disease, making it a high-value drug target.
• Small-molecule PKM2 activators and liver pyruvate kinase modulators can tune enzyme activity up or down, offering therapeutic strategies.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to dissect how pyruvate kinase activity drives disease phenotypes.
Description
Pyruvate kinase activity (GO:0004743) is a molecular function that catalyzes the irreversible transfer of a phosphate group from phosphoenolpyruvate (PEP) to ADP, producing ATP and pyruvate. This reaction is the final and rate-limiting step of glycolysis, and it is essential for maintaining cellular energy balance and biosynthetic precursor supply. The enzyme responsible, pyruvate kinase (PK), exists as several isoforms, with PKM2 being the most studied in proliferating cells and cancer. Because pyruvate kinase activity sits at the intersection of energy metabolism and anabolism, it has become a focal point for researchers studying cancer metabolism, immune activation, fibrosis, and metabolic disease. The enzyme is not simply a housekeeping catalyst; its activity is dynamically regulated by allosteric effectors, oligomeric state, and post-translational modifications that allow cells to reroute glycolytic flux. Understanding pyruvate kinase activity at the molecular, cellular, and organismal levels requires integrating biochemical assays, genetic models, and high-throughput screening. This article summarizes the authoritative GO definition, the core mechanism, the key genes and proteins involved, and the experimental methods used to study this function.
pyruvate kinase activity At A Glance
| GO ID | GO:0004743 |
|---|---|
| GO term | pyruvate kinase activity |
| Ontology | molecular_function |
| Synonym | ATP:pyruvate 2-O-phosphotransferase activity; phosphoenolpyruvate kinase activity; phosphoenol transphosphorylase activity |
| Major function | Catalysis of ADP + H+ + phosphoenolpyruvate = ATP + pyruvate |
| Reaction direction | Reversible in vitro but physiologically glycolytic (ATP-generating) |
| Cofactors | Divalent metal ions (Mg2+ or Mn2+) and monovalent cations (K+) |
| Major isoforms | PKM1, PKM2, PKLR (liver/RBC), PKM (muscle) |
| Regulation | Allosteric activation by fructose-1,6-bisphosphate; inhibition by ATP, alanine, and tyrosine phosphorylation |
What Is GO:0004743?
Pyruvate kinase activity (GO:0004743) is defined as the catalysis of the reaction: ADP + H+ + phosphoenolpyruvate = ATP + pyruvate. In other words, it is the enzymatic activity that transfers a phosphate group from phosphoenolpyruvate to ADP, generating pyruvate and ATP. This activity is synonymous with ATP:pyruvate 2-O-phosphotransferase activity, phosphoenolpyruvate kinase activity, and phosphoenol transphosphorylase activity.
Why Is pyruvate kinase activity Important in Cell Biology?
Pyruvate kinase activity is important because it controls the final committed step of glycolysis, determining whether glucose carbons are fully oxidized for ATP or diverted into biosynthetic pathways. In proliferating cells, the PKM2 isoform often exists in a low-activity dimeric state that favors lactate production and anabolic metabolism, a hallmark of the Warburg effect. Modulating this activity has therapeutic potential in cancer, inflammatory diseases, fibrosis, and diabetes, as shown by studies using small-molecule activators and genetic models.
• Controls the final step of glycolysis, directly producing ATP and pyruvate.
• PKM2 activity regulates HIF-1α and IL-1β induction in LPS-activated macrophages, linking metabolism to inflammation.
• S-nitrosylation of PKM2 promotes mitochondrial fission and cardiac fibrosis, showing a role in heart disease.
• PKM2 activators promote tetramer formation and suppress tumorigenesis in cancer models.
• Methionine oxidation activates PKM2 to drive pancreatic cancer metastasis.
• SIRT5-mediated desuccinylation activates PKM2 to block macrophage IL-1β production and prevent colitis.
• PKM2 activation may protect against diabetic glomerular pathology and mitochondrial dysfunction.
• Phosphoglycerate dehydrogenase activates PKM2 to phosphorylate histone H3T11 and attenuate cellular senescence.
• Liver pyruvate kinase activity can be tuned up or down with allosteric modulators, offering therapeutic options for metabolic disease.
• CRISPR-based models enable precise dissection of pyruvate kinase function in disease.
What Happens During pyruvate kinase activity?
Substrate binding and catalysis
In simple terms: The enzyme grabs PEP and ADP and transfers a phosphate group to make ATP and pyruvate.
Pyruvate kinase binds its substrates, phosphoenolpyruvate (PEP) and ADP, in a sequential ordered mechanism that requires divalent metal ions (Mg2+ or Mn2+) and monovalent cations (K+) for catalysis. The enzyme transfers the phosphate group from PEP to ADP, yielding pyruvate and ATP. This reaction is the final step of glycolysis and is essentially irreversible under physiological conditions.
Oligomeric state and allosteric regulation
In simple terms: The enzyme works best as a four-part complex, and small molecules can switch it on or off.
Pyruvate kinase functions as a tetramer for high activity, but the PKM2 isoform can exist in a less active dimeric state. Allosteric activators such as fructose-1,6-bisphosphate and synthetic small molecules promote tetramer formation and increase activity. Conversely, ATP, alanine, and tyrosine phosphorylation inhibit activity by favoring the dimeric state.
Post-translational modifications
In simple terms: Chemical tags added to the enzyme can change how active it is.
PKM2 activity is modulated by post-translational modifications including S-nitrosylation, succinylation, and methionine oxidation. S-nitrosylation of PKM2 drives cardiac fibrosis by promoting mitochondrial fission. SIRT5 desuccinylates and activates PKM2 to block macrophage IL-1β production and prevent colitis. Methionine oxidation activates PKM2 to promote pancreatic cancer metastasis.
Integration with cellular metabolism
In simple terms: The enzyme helps decide whether glucose is burned for energy or used to build new molecules.
Pyruvate kinase activity influences the balance between glycolysis and biosynthetic pathways. Low PKM2 activity favors the accumulation of glycolytic intermediates for anabolism, supporting proliferation. High activity promotes ATP production and pyruvate formation. This metabolic switch is regulated by oncogenic signals and is a hallmark of cancer cells.
Key Genes Involved in GO:0004743 pyruvate kinase activity
The following genes and proteins are directly involved in pyruvate kinase activity and its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PKM | Encodes PKM1 and PKM2 isoforms; catalyzes the final glycolytic step | Central to cancer metabolism and Warburg effect |
| PKLR | Encodes liver and red blood cell pyruvate kinase | Target for metabolic disease and hemolytic anemia |
| HIF1A | Transcription factor regulated by PKM2 activity | Links pyruvate kinase to inflammation and hypoxia |
| IL1B | Pro-inflammatory cytokine induced via PKM2-HIF-1α axis | Inflammation and colitis models |
| SIRT5 | Desuccinylates and activates PKM2 | Macrophage IL-1β production and colitis |
| PHGDH | Activates PKM2 to phosphorylate histone H3T11 | Cellular senescence and cancer |
| LDHA | Converts pyruvate to lactate, competing with pyruvate kinase flux | Warburg effect and cancer metabolism |
| PDH | Converts pyruvate to acetyl-CoA for TCA cycle | Metabolic flux studies |
| FBP1 | Produces fructose-1,6-bisphosphate, an allosteric activator of PKM2 | Glycolytic regulation |
| EGFR | Signaling pathway that regulates PKM2 activity | Cancer proliferation |
| JAK2 | Kinase that can phosphorylate and regulate PKM2 | Inflammation and myeloproliferative neoplasms |
| STAT3 | Transcription factor downstream of IL-6/JAK2, linked to PKM2 | Cancer and inflammation |
| mTOR | Central metabolic regulator that influences pyruvate kinase flux | Cell growth and metabolism |
| AMPK | Energy sensor that can modulate glycolytic enzymes | Metabolic stress responses |
| TP53 | Tumor suppressor that regulates glycolysis and PKM2 | Cancer metabolism |
| MYC | Oncogene that drives glycolytic gene expression including PKM | Cancer proliferation |
| KEAP1 | Regulates oxidative stress and may affect PKM2 oxidation | Cancer and oxidative stress |
How Is pyruvate kinase activity Regulated?
Pyruvate kinase activity is regulated at multiple levels. Allosteric effectors such as fructose-1,6-bisphosphate activate the enzyme, while ATP and alanine inhibit it. Post-translational modifications including S-nitrosylation, succinylation, and methionine oxidation directly alter catalytic activity. Signaling pathways such as mTOR, AMPK, and oncogenic kinases (e.g., EGFR, JAK2) influence pyruvate kinase flux by modulating enzyme expression or activity. Additionally, the oligomeric state of PKM2 is a key regulatory node, with tetramers being highly active and dimers favoring biosynthetic metabolism.
pyruvate kinase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PKM | Cancer (Warburg effect, metastasis) | PKM2 knockout or point-mutation cancer cell lines |
| PKM | Cardiac fibrosis | PKM2 S-nitrosylation knock-in mouse model |
| PKM | Inflammation and colitis | PKM2 knockout macrophages or DSS-colitis mice |
| PKLR | Diabetes and metabolic disease | Liver-specific PKLR knockout or knock-in mice |
| PKM | Cellular senescence | PKM2 overexpression or knockout in senescent cells |
Cancer metabolism and metastasis
Pyruvate kinase activity is dysregulated in many cancers. The PKM2 isoform is often highly expressed and exists in a low-activity state that supports the Warburg effect, promoting lactate production and anabolic growth. Small-molecule activators that force PKM2 into tetramers suppress tumorigenesis in preclinical models. Methionine oxidation of PKM2 activates the enzyme and promotes pancreatic cancer metastasis, highlighting context-dependent roles.
Inflammation and colitis
In LPS-activated macrophages, PKM2 activity regulates HIF-1α and IL-1β induction, linking glycolysis to inflammation. SIRT5-mediated desuccinylation activates PKM2 to block macrophage IL-1β production and prevent DSS-induced colitis in mice. These findings suggest that modulating pyruvate kinase activity could be therapeutic in inflammatory bowel disease.
Cardiac fibrosis and mitochondrial dysfunction
S-nitrosylation of PKM2 drives cardiac fibrosis by promoting mitochondrial fission. This modification reduces pyruvate kinase activity and alters mitochondrial dynamics, contributing to fibrotic remodeling. The study highlights a direct link between pyruvate kinase activity and heart disease.
Diabetes and metabolic disease
PKM2 activation may protect against diabetic glomerular pathology and mitochondrial dysfunction. Liver pyruvate kinase (PKLR) activity can be tuned up or down with allosteric modulators, offering potential for treating metabolic disorders. These studies indicate that pyruvate kinase activity is a viable target in diabetes and related conditions.
From pyruvate kinase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of pyruvate kinase activity affect tumor growth? | PKM knockout cancer cell lines and xenografts |
| How does a specific point mutation alter enzyme kinetics? | CRISPR point-mutation knock-in of PKM2 mutants |
| Does tagging PKM2 reveal its localization? | Knock-in of fluorescent or epitope tags at the endogenous PKM locus |
| Does overexpression of PKM2 drive metastasis? | PKM2 overexpression in cancer cell lines and mouse models |
| Can allosteric modulators tune liver pyruvate kinase? | PKLR knock-in mice with humanized enzyme |
| What is the role of PKM2 in inflammation? | Macrophage-specific PKM2 knockout mice |
How to Study the pyruvate kinase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Coupled enzyme assay | Pyruvate kinase catalytic activity | Kinetic studies and inhibitor screening |
| Seahorse flux analysis | Glycolytic rate and oxygen consumption | Live-cell metabolic phenotyping |
| 13C-glucose tracing | Flux through glycolysis and TCA cycle | Metabolic pathway analysis |
| Western blot | Protein expression and modifications | Detection of S-nitrosylation, succinylation |
| Immunoprecipitation | Protein-protein interactions | Identification of PKM2 complexes |
| CRISPR knockout | Loss-of-function phenotypes | Target validation in cancer and inflammation |
| Small-molecule screening | Activators or inhibitors of enzyme activity | Drug discovery for cancer and metabolic disease |
Enzymatic activity assays
Pyruvate kinase activity is typically measured using coupled enzyme assays that monitor NADH oxidation at 340 nm or by detecting pyruvate with lactate dehydrogenase. These assays can be performed on cell lysates or purified protein to determine kinetic parameters and the effects of allosteric modulators.
Metabolic flux analysis
Seahorse extracellular flux analysis and stable isotope tracing (e.g., 13C-glucose) measure glycolytic rate and lactate production, providing functional readouts of pyruvate kinase activity in live cells. These methods are essential for linking enzyme activity to metabolic phenotypes.
Post-translational modification detection
Western blotting with modification-specific antibodies, mass spectrometry, and immunoprecipitation are used to detect S-nitrosylation, succinylation, and oxidation of pyruvate kinase. These techniques reveal how modifications alter enzyme activity.
Genetic and pharmacological perturbation
CRISPR knockout, RNA interference, and small-molecule activators/inhibitors are used to manipulate pyruvate kinase activity and assess downstream effects on proliferation, inflammation, and metabolism. These approaches are critical for target validation.
How CRISPR Can Be Used to Study GO:0004743 pyruvate kinase activity
Knockout
CRISPR knockout of PKM or PKLR eliminates pyruvate kinase activity, allowing researchers to study its role in glycolysis, proliferation, and disease. For example, PKM2 knockout in macrophages reduces IL-1β production and alters inflammatory responses. Knockout models are essential for distinguishing isoform-specific functions.
Point Mutation
CRISPR point mutation can introduce specific amino acid changes (e.g., at phosphorylation or oxidation sites) to test how post-translational modifications affect pyruvate kinase activity. This approach has been used to study methionine oxidation of PKM2 in pancreatic cancer metastasis.
Knock-in
Knock-in of tags (e.g., FLAG, GFP) or disease-associated mutations at the endogenous PKM locus enables real-time tracking of protein localization and activity. Knock-in models of S-nitrosylated PKM2 have been used to study cardiac fibrosis.
Overexpression
CRISPR activation or lentiviral overexpression of PKM2 or PKLR increases pyruvate kinase activity, allowing gain-of-function studies. Overexpression of PKM2 promotes metastasis in pancreatic cancer models and can be used to test therapeutic interventions.
How EDITGENE Supports pyruvate kinase activity Research
Researchers studying pyruvate kinase activity-related genes often need to determine whether a candidate gene is causally involved in metabolic, inflammatory, or oncogenic phenotypes. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional validation of pyruvate kinase pathway components.
Contact EDITGENE today to design your custom CRISPR model for pyruvate kinase activity research.
Frequently Asked Questions About pyruvate kinase activity
What is pyruvate kinase activity?
Pyruvate kinase activity (GO:0004743) is the enzymatic function that catalyzes the transfer of a phosphate group from phosphoenolpyruvate to ADP, producing ATP and pyruvate, the final step of glycolysis.
What genes are involved in pyruvate kinase activity?
The main genes are PKM (encoding PKM1 and PKM2 isoforms) and PKLR (encoding liver and red blood cell pyruvate kinase). Other genes such as HIF1A, SIRT5, and PHGDH regulate pyruvate kinase activity.
How is pyruvate kinase activity regulated?
It is regulated by allosteric effectors (fructose-1,6-bisphosphate, ATP, alanine), oligomeric state (tetramer vs dimer), and post-translational modifications including S-nitrosylation, succinylation, and methionine oxidation.
What diseases are linked to pyruvate kinase activity?
Dysregulated pyruvate kinase activity is linked to cancer, cardiac fibrosis, inflammatory bowel disease, diabetes, and cellular senescence.
How can I measure pyruvate kinase activity in the lab?
Common methods include coupled enzyme assays, Seahorse flux analysis, and 13C-glucose tracing. Post-translational modifications can be detected by Western blot and mass spectrometry.
What is the role of PKM2 in cancer?
PKM2 often exists in a low-activity dimeric state that supports the Warburg effect, promoting lactate production and anabolic growth. Activators that force tetramer formation can suppress tumorigenesis.
Can pyruvate kinase activity be targeted therapeutically?
Yes, small-molecule activators and allosteric modulators of PKM2 and PKLR are being developed for cancer, diabetes, and inflammatory diseases.
What CRISPR models are available for studying pyruvate kinase activity?
Knockout, point mutation, knock-in, and overexpression models can be generated for PKM, PKLR, and related genes to study function and disease mechanisms.
How does SIRT5 regulate pyruvate kinase activity?
SIRT5 desuccinylates and activates PKM2, which blocks macrophage IL-1β production and prevents DSS-induced colitis in mice.
What is the connection between pyruvate kinase activity and cellular senescence?
Phosphoglycerate dehydrogenase activates PKM2 to phosphorylate histone H3T11, which attenuates cellular senescence.
Conclusion
Pyruvate kinase activity (GO:0004743) is a fundamental molecular function that catalyzes the final step of glycolysis, producing ATP and pyruvate. Its regulation by allosteric effectors, oligomeric state, and post-translational modifications makes it a critical node in cancer, inflammation, fibrosis, and metabolic disease. Understanding this activity requires integrated biochemical, genetic, and pharmacological approaches. EDITGENE provides comprehensive CRISPR services, including knockout, point mutation, knock-in, overexpression, and library screening, to help researchers dissect the roles of pyruvate kinase and its regulators in health and disease. By leveraging these tools, the scientific community can accelerate the development of targeted therapies.
References
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- 2. Luo S et al.. 2026. S-Nitrosylation of Pyruvate Kinase Isoform 2 Drives Cardiac Fibrosis by Promoting Mitochondrial Fission.. Circulation 153(5):338-357 PMID: 41368700
- 3. Anastasiou D et al.. 2012. Pyruvate kinase M2 activators promote tetramer formation and suppress tumorigenesis.. Nat Chem Biol 8(10):839-47 PMID: 22922757
- 4. He D et al.. 2022. Methionine oxidation activates pyruvate kinase M2 to promote pancreatic cancer metastasis.. Mol Cell 82(16):3045-3060.e11 PMID: 35752173
- 5. Wang F et al.. 2017. SIRT5 Desuccinylates and Activates Pyruvate Kinase M2 to Block Macrophage IL-1β Production and to Prevent DSS-Induced Colitis in Mice.. Cell Rep 19(11):2331-2344 PMID: 28614718
- 6. Qi W et al.. 2017. Pyruvate kinase M2 activation may protect against the progression of diabetic glomerular pathology and mitochondrial dysfunction.. Nat Med 23(6):753-762 PMID: 28436957
- 7. Wu Y et al.. 2023. Phosphoglycerate dehydrogenase activates PKM2 to phosphorylate histone H3T11 and attenuate cellular senescence.. Nat Commun 14(1):1323 PMID: 36899022
- 8. Nain-Perez A et al.. 2023. Tuning liver pyruvate kinase activity up or down with a new class of allosteric modulators.. Eur J Med Chem 250:115177 PMID: 36753880
